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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9edfa7f61a74b52a5ee1d0cf76bda4797e9e2a4ccccc8a3bf41b22365ad1669' 
  AND token = '/5UM6mCSE7Cub0fCvGbZMlsK4Z2NLfqja4V6e61iczY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}